PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Probabilistic non-linear Principal Component Analysis with Gaussian Process Latent Variable Models
Neil Lawrence
Journal of Machine Learning Reasearch Volume 6, pp. 1783-1816, 2005. ISSN 1533-7928


Summarising a high dimensional data-set with a low dimensional embedding is a standard approach for exploring its structure. In this paper we provide an overview of some existing techniques for discovering such embeddings. We then introduce a novel probabilistic interpretation of principal component analysis (PCA) that we term dual probabilistic PCA (DPPCA). The DPPCA model has the additional advantage that the linear mappings from the embedded space can easily be non-linearised through Gaussian processes. We refer to this model as a Gaussian process latent variable model (GPLVM). We develop a practical algorithm for GPLVMs which allow for non-linear mappings from the embedded space giving a non-linear probabilistic version of PCA. We develop the new algorithm to provide a principled approach to handling discrete valued data and missing attributes. We demonstrate the algorithm on a range of real-world and artificially generated data-sets and finally, through analysis of the GPLVM objective function, we relate the algorithm to popular spectral techniques such as kernel PCA and multidimensional scaling.

PDF - Requires Adobe Acrobat Reader or other PDF viewer.
EPrint Type:Article
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Learning/Statistics & Optimisation
Theory & Algorithms
ID Code:914
Deposited By:Neil Lawrence
Deposited On:06 January 2005